Question

Lawrence Craven, a doctor from the USA, is the author of several published reports, one of ________ introduced the idea in 1953 _________ aspirin could reduce the risk of heart attacks.

A．them; when

B．which; that

C．what; that

D．which; when

Answer 1

B

試題分析：考查定語(yǔ)從句。本定語(yǔ)從句的先行詞是reports，which指代reports作為of的賓語(yǔ)。第二空的定語(yǔ)從句先行詞是1953，本定語(yǔ)從句結(jié)構(gòu)很完整，所以使用關(guān)系副詞when。故B正確。
點(diǎn)評(píng)：定語(yǔ)從句的關(guān)鍵在于分析句子成分，如果句子很完整就使用冠詞副詞；如果句子中缺少主語(yǔ)，賓語(yǔ)，表語(yǔ)或者定語(yǔ)則使用關(guān)系代詞。